Black metall rail with a metric scale (one point equals to one mm). The length of the rail is 10, 20, 30, 40, and 50 cm (other lengths are possible by request). The rail has two magnets on the rear surface and can be fixed on the metall board. Also it has a hole with the thread M6 (other threads are possible by request).

Black metall holder. Two (or four) magnets in the base allow to arrange it on any metall board. The lower part of the holder has a cut for the Rail. The upper part of the holder has another cut that is used to attach the Mount. The height of the optical axis can be varied by user.

Black metall mount. It can be attached by two screws to the Holder. The mount is suited for optical elements with external diameters of 25mm (other diameters are possible by request). Optical elements are fixed by a screw.